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A081891 as a simple table

na(n)
01
14
214
364
4830
514704
6228734
73136144
839450110
9468241264
105338397054
1159140070224
12641540046590
136850671429424
1472282030453374
15755587489260304
167840735233590270
1780889167950995184
18830567232465613694
198495462278285810384
2086620589245358801150
21880864903819470714544

[1,4,14,64,830,14704,228734,3136144,39450110,
 468241264,5338397054,59140070224,641540046590,
 6850671429424,72282030453374,755587489260304,
 7840735233590270,80889167950995184,
 830567232465613694,8495462278285810384,
 86620589245358801150,880864903819470714544]